TechnicalInformationTI 199C/24/ae

Dissolved Oxygen Measurement

liquisys M COM 223 / 253

Oxygen Controller

Liquisys M COM 253

Liquisys M COM 223

Due to the modularity of its design, theLiquisys S COM 223 / 253 controller canbe adapted to a wide range of customerneeds. The basic version, whichprovides simple measuring and alarmsignaling functions, can be equippedwith additional software and hardwaremodules to match specific applications.Retrofitting of expansion modules isalso possible.

Areas of application

• Waste water treatment plants

• Effluent treatment• Water treatment and water monitoring• Drinking water• Surface water:

rivers, lakes, ocean• Fish farming

Benefits at a glance

• Measuring controller in field orpanel-mounted housing

• Universal application– Switchable between oxygen

concentration in mg/l andsaturation index in % SAT viasoftware switching (mg/l = ppm)

• Simple handling– Logically arranged menu structure

with plain text in 6 languagesfacilitates instrument configuration

– Large, two-line display indicatesmeasured value and temperatureat the same time

– Simple one-point calibration in airor in the medium

• Safe Operation– Overvoltage (lightning) protection

according to EN 61000-4-5– Direct access for manual contact

control• CSA GP* and CE approved

* please consult factory

The basic unit can be extended with:• 2 or 4 contacts for use as:

− Limit contacts (also fortemperature)

− PID controller

− Timer for simple rinse processes

− Complete cleaning withChemoclean

• Plus package:

− Automatic pressure compensation

− Any current output configurationvia table

− Automatic initiation of cleaning incase of alarm or limit violation

− Live check of sensorProcess monitoring

• HART® or PROFIBUS PA and DP• 2nd current output for temperature

Details Liquisys M COM 223 / 253 provides asolution for all water and waste watertreatment applications.

Features of the basic version (DX):

Measurement of oxygen concentrationin mg/l or % saturationThis is selected via the menu. Thetemperature is displayed at the sametime or, if desired, not shown at all.

The COS 41 sensor has no zero currentand therefore only requires one-pointcalibration. This is performed in air(corresponding to 100% saturation) orby reference calibration in the medium.

Different alarms are required dependingon application and operator. Thereforethe Liquisys M COM 223 / 253 permitsindependent configuration of the alarmcontact and error current for eachindividual error. Unnecessary orundesirable alarms can be suppressedin this manner.

Up to four contacts can be used as limitcontacts (also for temperature), toimplement a PID controller or forcleaning functions.

Direct manual operation of thecontacts (bypassing the menu)provides quick access to limit, control orcleaning contacts, permitting speedycorrection of deviations.

The serial numbers of the instrumentand modules and the order code can becalled up on the display.

The DS version provides additionalfunctions:

The oxygen concentration not onlydepends on the local altitude, but alsoon the weather (air pressure). Theautomatic pressure compensationfunction takes these fluctuations intoaccount.

In order to display wide measuringranges while still achieving a highresolution in specific ranges, the currentoutput can be configured as required viaa table. This permits bilinear orquasi-logarithmic curves.

The live check issues an alarm whenthe sensor signal does not change overa defined period of time. This may becaused by blocking, passivation, orseparation from the process.

The Process Check System is used tomonitor adjustable time intervals, e.g.for permanent aeration or permanentabsence of aeration.

E 017E 123- - - -

onoffon

offonoff

2.4 / 22 mA

offon

Timer

toff

offon

onChemoclean

t

Instrument DATA

eS r Nr I1

1 56 3 4 83

pO2

t0

20

mA

2

0

20

mA

Basic Version and

Plus Package

Measuring and Control

System

A complete measuring systemcomprises:• the oxygen controller Liquisys MCOM 223 or COM 253

• an oxygen sensor COS 41 with anintegrated NTC temperature sensor

• an immersion, flow or retractableholder

Options:

• extension cable (type CMK), and• junction box VBM

Up to 4 relays

Alarm contact

Signal output 1:oxygen

Signal output 2:temperature (optional)

Aux. 15 V supply voltage

2 digital inputs

Power supply

Mounting examplewith Liquisys M COM 223 / 253

3

ENDRESS+HAUSERLIQUISYS

CAL REL

REL1

REL1

ALARMREL2

REL2E

ENDRESS+HAUSERLIQUISYS

CAL REL

REL1

REL1

ALARMREL2

REL2E

Liquisys M COM 253

Weather protection

Immersionholder

CYA 611

Oxygen sensorCOS 41

Retractable holderCOA 461

Liquisys M COM223

Basic Version With plus package (DS version)

Alarm signaling Alarm signaling

MEASUREMENT

CALIBRATION Automatic PRESSURE COMPENSATION

Read instrument DATA PROCESS CHECK SYSTEM for monitoring,e.g. of aeration

Linear CURRENT OUTPUT CURRENT OUTPUT simulation LIVE CHECK of sensor

1 programmable ALARM CONTACT CURRENT OUTPUT programmable (table) (contact and error current)

Additional features Additional features

Controlling Controlling

2 CHANGEOVER CONTACTS for

- Measuring parameter limit - Temperature limit Automatic cleaning triggered by alarm or limit - PID controller violation - Timer for cleaning

Additional features Additional features

Cleaning Cleaning

2 more CHANGEOVER CONTACTS (total of 4) for

- Measuring parameter limit - Temperature limit Cleaning triggered externally or automatically - PID controller by alarm or limit violation - Chemoclean cleaning (water and cleaning agent)

Operation

Liquid crystal displayfor display ofmeasured values,configuration dataand current menu field

4 main control keys forcalibration andinstrument configuration

Key for switchingbetween automatic andmanual relay operation

LED indicatorsfor switched limitoutputs

Field for userlabeling

Key for manualrelay switching

LED indicator foralarm function

User interface:Display and keys

Everything at a glance

The display simultaneously shows thecurrent measured value and thetemperature – the essential processdata. Brief informational texts in theconfiguration menu provide assistancewith parameter configuration.

Intelligent and simple

All instrument control functions arearranged in a logical menu structure.Following access code entry, theindividual parameters can be easilyselected and modified as needed.

Overview of Liquisys MCOM 223 / 253 menu.This covers allthe options that can beinstalled (see page 2Details).

4

SETUP 1

SETUP 2

ALARM

CHECK

RELAYS

SERVICE

CURRENT OUTPUT

Selection of measurement type and unit, adjustment of measured value filter,altitude adjustment

Adjustment of current output assignment, curve and simulation for verification

User adjustment of errors to switch relay or generate error current(S version: automatic cleaning trigger in the event of an alarm)

Process Check System and live check alarm adjustment

Up to 4 relays may be configured as limit contacts, PID controller, timeror for chemical cleaning (S version: automatic cleaning trigger in caseof limit violation)

Selection of language version, display of software or hardware serialnumbers, entry of access codes

Temperature measurement, salinity correction

CALIBRATION Calibration in air or in the medium

Current temperature display can be suppressed by pressing the PLUS key

Display of active errors (sequence according to priority)

MEAS. VALUE

TEMPERATURE

Display

L+

L–

L

N

=

41

42

43

47

57

51

54

48

58

52

55

49

59

53

56

15 V85

86

10 to 50 V

93

94

mA

10 to 50 V

81

34

33

82

mA

32

31

91

11bn

12

gn

rd

90

O2

S

K

AA

K

NTC

O2

Electrical Connection

Left:Liquisys M COM 223,connections on the rearof the instrument

Right:Liquisys M COM 253,rear of instrument withreplaceable electronicsbox (E)

Electrical connection ofLiquisys M COM 223 / 253

All connections to the panel-mountedinstrument COM 223 are established viathe terminal strips on the rear.In the case of the field instrument COM253, all wires (including the sensorcable) are connected to terminals in aseparate wiring compartment.

All the wiring can remain in place if theinstrument needs repair because allrepairs are limited to assemblyreplacement. Dismantling the instrumentand rewiring is not necessary.

Sensor COS 41

Signal output 1:oxygen

Signal output 2:temperature(optional)

Digital input 1

Digital input 2

Aux. voltageoutput

Alarm*

Relay 1*

Relay 2*

Relay 3*

Relay 4*

optional

*Contactstatus shown:no current orfault present

Power supply

E

5

ENDRESS+HAUSER

LIQUISYS

CAL REL

REL1

REL1

ALARM

REL2

REL2E

ENDRESS+HAUSERLIQUISYS

CAL REL

REL1

REL1

ALARMREL2

REL2E

Dimensions

3.54”(90)

5.47”(139)

0.24”(6)

3.78”(96)

Dimensions ofLiquisys M COM 253

Dimensions ofLiquisys M COM 223

6

9.72”(247)

Ø 0.24”(6)

4.53”(115)

6.18”(157)

0.43”(11)

2.75”(70)

2.75”(70)

6.06”(154)6.69”(170)

Mounting of

Liquisys M COM 223

The panel-mounted version is mountedusing the supplied tensioning screws.The required overall mounting depth isapproximately 6.89 in. (175 mm).

3.62”+0.02”

(92+0.5)

3.62”+0.02”

(92+0.5)

3.78”(96)

max. 1.77”(45)

0.24”(6)

5.47”(139)

approx.0.98”(25)

1.30”(33)

2.24”(57)

3.54”(90)

Flat gasket(included in delivery)

Mounting cutoutaccording toDIN 43700

Installation of panel-mounted housing

7

6.18”(157)

Ø 0.31”(8)

0.63”(16)

4.53”(115)

Mounting of

Liquisys M COM 253

8

Wall mountingScrews: Ø 0.24” (6 mm)Anchors: Ø 0.31” (8 mm)

Mounting on cylindricalpipes (shown withweather protection coverinstalled on right)

Post mounting kit forinstallation of field housingon cylindrical pipes(horizontal or vertical,max. Ø 2.36” (60 mm);see Accessories)

3.54”(90)

1.18”(30)

Ø 0.31”(8)

2.36”(60)

0.24”(M 6)

3.54”(90)

2.76”(70)

Ø 0.31”(8)

Ø 0.24”(6)2.76”

(70)3.54”(90)

2.76”(70)

9

Technical DataGeneral specifications

Input

Output

Manufacturer Endress+Hauser

Product designation Liquisys M COM 223Liquisys M COM 253

Measured quantities O2 / temperature

O2 measurement with sensor COS 41

Display and measuring range 0 to 20 mg/l or 0 to 200% SAT (1 mg/l = 1 ppm)

Temperature compensation range 0 to 122 °F (0 to 50 °C)

Pressure compensation range (optional) 0 to 1200 hPa

Altitude adjustment range 0 to 13,300 ft. (0 to 4000 m)

Salinity adjustment range 0 to 4%

O2 signal input

Signal current 0 to 3000 nA

Slope adaptation 75 to 140% of nominal slope

Nominal slope (sensor in air, 20 °C, 1013 mbar) 290 nA

Maximum length of cable to sensor 160 ft. (50 m)

Temperature measurement

Temperature sensor NTC, 30 kΩ at 77 °F (25 °C)

Measuring range 14 to 140 °F (- 10 to + 60 °C)

Temperature offset range ± 68 °F (± 20 °C)

Digital inputs 1 and 2

Voltage 10 to 50 V

Current consumption max. 10 mA

O2 signal output

Current range 0 / 4 to 20 mA, galvanically separated;error current 2.4 / 22 mA

Load max. 500 Ω Output range ∆ 2 to ∆ 20 mg/l or ∆ 20 to ∆ 200% SAT

Isolation voltage max 350 Vrms

/ 500 V DC

Overvoltage (lightning) protection acc. to EN 61000-4-5: 1995

Temperature signal output (optional)

Current range 0 / 4 to 20 mA, galvanically separated

Load max. 500 Ω Output range adjustable, ∆ 10 to ∆ 100% of upper range value

Isolation voltage max 350 Vrms

/ 500 V DC

Overvoltage (lightning) protection acc. to EN 61000-4-5: 1995

Auxiliary voltage output

Output voltage 15 V ± 0.6 VDC

Output current max. 30 mA

Contact outputs (floating changeover contacts)

Switching current with ohmic load (cos ϕ = 1) max. 2 A

Switching current with inductive load (cos ϕ = 0.4) max. 2 A

Switching voltage max. 250 V AC, 30 V DC

Switching power with ohmic load (cos ϕ = 1) max. 1250 VA AC, 150 W DC

Switching power with inductive load (cos ϕ = 0.4) max. 500 VA AC, 90 W DC

Limit contactor

Limit adjustment range 0 to 20 mg/l or 0 to 200% SAT

Pickup / dropout delay 0 to 7200 seconds

Technical Data

(continued)

Output (continued)

Accuracy

Ambient conditions

Physical data / design

Power requirements

10

¹acc. to IEC 746-1, for nominal operating conditionsSubject to modifications.

Controller

Function (adjustable) Pulse length / pulse frequency controller

Controller response PID

Proportional band Kp: 0.10 to 10.00

Period for pulse length controller 0.5 to 999.9 seconds

Frequency for pulse frequency controller 60 to 180 min-1

Alarm

Function (switchable) steady / fleeting contact; normally closed / open

Alarm threshold adjustment range O2 / temperature: complete measuring range

Alarm delay 2 to 2000 seconds

Monitoring time for lower limit violation 0 to 2000 min

Monitoring time for upper limit violation 0 to 2000 min

O2 measurement with sensor COS 41

Resolution 0.01 mg/l or 0.1% SAT

Deviation of indication1 max. 0.5% of measuring range

Reproducibility max. 0.2% of measuring range

Measurement deviation1, O2 signal output max. 0.75% of measuring range

Temperature measurement

Resolution 0.2 °F or 0.1 °C

Deviation of indication1 max. 1.0% of measuring range

Measurement deviation1, temperature signal output max. 1.25% of current output range

Nominal operating temperature 14 to 131 °F (-10 to +55 °C)

Ambient temperature (limit operating conditions) -4 to 140 °F (-20 to +60 °C)

Storage and transport temperature -13 to 149 °F (-25 to +65 °C)

Relative humidity (nominal operating conditions) 10 to 95%, non-condensing

Protection class of panel-mounted unit NEMA 3S (IP 54 (front), IP 30 (housing))

Protection class of field housing NEMA 4X (IP 65)

Electromagnetic compatibility interference emission acc. to EN 50081-1: 1992interference immunity acc. to EN 50082-2: 1995

Dimensions of panel-mounted unit (H x W x D) 3.78 x 3.78 x 5.71 in. (96 x 96 x 145 mm)

Installation depth approx. 6.89 in. (175 mm)

Dimensions of field housing (H x W x D) 9.72 x 6.69 x 4.53 in. (247 x 170 x 115 mm)

Weight of panel-mounted unit max. 1.54 lb. (0.7 kg)

Weight with field housing max 5.07 lb. (2.3 kg)

Display LC display, two lines, five and nine digits, withstatus indicators

Materials

Housing of panel-mounted unit polycarbonate

Front membrane polyester, UV-resistant

Field housing ABS PC Fr

Supply voltage 100 / 115 / 230 V AC +10 / -15%, 48 to 62 Hz24 V AC/DC +20 / -15%

Power consumption max. 7.5 VA

Fuse protection fine-wire fuse, medium time-lag, 250 V / 1 A

Accessories

11

Mounting accessories

Type Features Order numberPendulum For pendulum suspension of assemblies 50080196frame e.g. CYA 611

Material: 304 SSPost mounting Kit for mounting of field housing on 50086842kit horizontal or vertical pipes, max.

diameter, 2.5” (60 mm)Material: 304 SS

Holders

Type Features ApplicationsCYA 611 Immersion assembly with G 1, G 3/4 Sewage, water

or 3/4” NPT threadCOA 250 Flow holder with screwed G 3/4 measuring Installation for flow

connection operating, e.g. inwaterworks oranalytical cabinets

Probfit Retractable holder with DN 50 or 2” ANSI Installation for in-lineCOA 461 flange operation, e.g. in

pipelines or on tankwalls

COA 110-50 Floating immersion holder Waste water, water,in basins withchanging levels

Oxygen sensor

Type Features ApplicationsCOS 41 Amperometric two-electrode sensor in Waste water, drinking

all plastic housing with permanently water, surface water,attached cable, cable length 22 ft. (7 m) fish farmingor 50 ft. (15 m), protection class NEMA 6P(IP 68), with integrated temperature sensor

Cables

Type Features Order numberVBM Junction box for extension of cable 51500177

connection between measuring cableand instrument, protection type NEMA 4X(IP 65)

CMK Special measuring cable for extension of 50005374line between transmitter and junction boxVBM

Product structure

Oxygen transmitter Liquisys M COM 223 / COM 253

COM 233 -

1 VersionDX Oxygen measurementDS Oxygen measurement, automatic pressure compensation,

additional functions2 Power Supply

0 230 VAC1 115 VAC2 230 VAC, CSA general purpose3 115 VAC, CSA general purpose5 100 VAC7 24 VAC / VDC, CSA general purpose8 24 VAC / VDC

3 Measurement output0 Oxygen1 Oxygen and temperature3 Profibus PA4 Profibus DP5 Oxygen with HART6 Oxygen with HART and temperature

4 Contacts05 No additional contacts10 2 contacts (limit / PID / timer)15 4 contacts (limit / PID / Chemoclean)16 4 contacts (limit / PID / timer)

United States

Endress+Hauser, Inc.2350 Endress PlaceGreenwood, IN 46143Phone: (317) 535-7138888-ENDRESSFAX: (317) 535-8498

TI 199C/24/ae/05.02© 2002 Endress+Hauser, Inc.

Canada

Endress+HauserCanada Ltd.1440 Graham’s LaneUnit 1, BurlingtonON, L7S 1W3Phone: (905) 681-9292800-668-3199FAX: (905) 681-9444

Mexico

Endress+HauserPaseo del Pedregal No. 610Col. Jardines del Pedregal01900, Mexico D.F.MexicoPhone: (525) 568-2405FAX: (525) 568-7459

For application and selection assistance,in the U.S. call 888-ENDRESS

For total support of your installed base, 24 hoursa day, in the U.S. call 800-642-8737

Visit us on our web site, www.us.endress.com

Endress+HauserThe Power of Know How

1 2 3 4

COM 253 -

1 VersionDX Oxygen measurementDS Oxygen measurement, automatic pressure compensation,

additional functions2 Power Supply

0 230 VAC1 115 VAC2 230 VAC, CSA general purpose3 115 VAC, CSA general purpose5 100 VAC7 24 VAC / VDC, CSA general purpose8 24 VAC / VDC

3 Measurement output0 Oxygen1 Oxygen and temperature3 Profibus PA4 Profibus DP5 Oxygen with HART6 Oxygen with HART and temperature

4 Contacts05 No additional contacts10 2 contacts (limit / PID / timer)15 4 contacts (limit / PID / Chemoclean)16 4 contacts (limit / PID / timer)

1 2 3 4